TSA Officer and fellow vaper here, speaking on the subject of bringing your mods and batteries through airport security, but
not speaking
for or on behalf of TSA as an entity, blah blah blah blah all the legal mumbo jumbo. ust my personal two cents from my experience. Going through security, none of the regular vaping stuff, i.e. regulated mods, eGo batteries, 1650 batteries, and juices should cause any problems unless you're carrying a lot, and I mean a lot, of ejuice or have a really crazy funky looking Mechanical mod. 3.4 oz of liquid rule still applies. If you're really that weary, bring your setup assembled, tank on, juice filled, and just leave it outside of your bag, in the tray with the rest of your items. Most bag checks are "I don't know what that is" bag checks, and we like to be safe rather than sorry. If they can see it's just your ecig, more often than not you'll fly by security hassle free.The problem, specifically with batteries, I presume would be with the Customs side of flying, but that's going in and out of the country. They don't like batteries much lol hope I shed a bit of light here. Happy vaping!
